| rfc9071v2.txt | rfc9071.txt | |||
|---|---|---|---|---|
| skipping to change at line 727 ¶ | skipping to change at line 727 ¶ | |||
| | With audio and video media, the CSRC list would often contain | | With audio and video media, the CSRC list would often contain | |||
| | all participants who are not muted, whereas text participants | | all participants who are not muted, whereas text participants | |||
| | that don't type are completely silent and thus are not | | that don't type are completely silent and thus are not | |||
| | represented in RTP packet CSRC lists. | | represented in RTP packet CSRC lists. | |||
| 3.10. Empty T140blocks | 3.10. Empty T140blocks | |||
| If no unsent T140blocks were available for a source at the time of | If no unsent T140blocks were available for a source at the time of | |||
| populating a packet but already-transmitted T140blocks are available | populating a packet but already-transmitted T140blocks are available | |||
| that have not yet been sent the full intended number of redundant | that have not yet been sent the full intended number of redundant | |||
| transmissions, then the primary T140block in the packet is composed | transmissions, then the primary area in the packet is composed of an | |||
| of an empty T140block and populated (without taking up any length) in | empty T140block and included (without taking up any length) in the | |||
| a packet for transmission. The corresponding SSRC SHALL be placed as | packet for transmission. The corresponding SSRC SHALL be placed as | |||
| usual in its place in the CSRC list. | usual in its place in the CSRC list. | |||
| The first packet in the session, the first after a source switch, and | The first packet in the session, the first after a source switch, and | |||
| the first after a pause SHALL be populated with the available | the first after a pause SHALL be populated with the available | |||
| T140blocks for the source selected to be sent as the primary, and | T140blocks for the source selected to be sent as the primary, and | |||
| empty T140blocks for the agreed-upon number of redundancy | empty T140blocks for the agreed-upon number of redundancy | |||
| generations. | generations. | |||
| 3.11. Creation of the Redundancy | 3.11. Creation of the Redundancy | |||
| skipping to change at line 1150 ¶ | skipping to change at line 1150 ¶ | |||
| The default maximum rate of reception of "text/t140" real-time text, | The default maximum rate of reception of "text/t140" real-time text, | |||
| as specified in [RFC4103], is 30 characters per second. The actual | as specified in [RFC4103], is 30 characters per second. The actual | |||
| rate is calculated without regard to any redundant text transmission | rate is calculated without regard to any redundant text transmission | |||
| and is, in the multiparty case, evaluated for all sources | and is, in the multiparty case, evaluated for all sources | |||
| contributing to transmission to a receiver. The value MAY be | contributing to transmission to a receiver. The value MAY be | |||
| modified in the "cps" parameter of the "fmtp" attribute for the | modified in the "cps" parameter of the "fmtp" attribute for the | |||
| "text/t140" format of the "text" media section. | "text/t140" format of the "text" media section. | |||
| A mixer combining real-time text from a number of sources may | A mixer combining real-time text from a number of sources may | |||
| occasionally have a higher combined flow of text coming from the | occasionally have a higher combined flow of text coming from the | |||
| sources. Endpoints SHOULD therefore specify a suitable higher value | sources. Endpoints SHOULD therefore include a suitable higher value | |||
| for the "cps" parameter, corresponding to its real reception | for the "cps" parameter, corresponding to its real reception | |||
| capability. The default "cps" value 30 can be assumed to be | capability. The default "cps" value 30 can be assumed to be | |||
| sufficient for small meetings and well-managed larger conferences | sufficient for small meetings and well-managed larger conferences | |||
| with users only making manual text entry. A "cps" value of 90 can be | with users only making manual text entry. A "cps" value of 90 can be | |||
| assumed to be sufficient even for large unmanaged conferences and for | assumed to be sufficient even for large unmanaged conferences and for | |||
| cases when speech-to-text technologies are used for text entry. This | cases when speech-to-text technologies are used for text entry. This | |||
| is also a reachable performance for receivers in modern technologies, | is also a reachable performance for receivers in modern technologies, | |||
| and 90 is therefore the RECOMMENDED "cps" value. See [RFC4103] for | and 90 is therefore the RECOMMENDED "cps" value. See [RFC4103] for | |||
| the format and use of the "cps" parameter. The same rules apply for | the format and use of the "cps" parameter. The same rules apply for | |||
| the multiparty case. | the multiparty case. | |||
| skipping to change at line 1425 ¶ | skipping to change at line 1425 ¶ | |||
| switch if appropriate. Increase the display count by 1. | switch if appropriate. Increase the display count by 1. | |||
| CR LF (U+000D U+000A): A supported, but not preferred, way of | CR LF (U+000D U+000A): A supported, but not preferred, way of | |||
| requesting a new line. Check and perform a source switch if | requesting a new line. Check and perform a source switch if | |||
| appropriate. Increase the display count by 1. | appropriate. Increase the display count by 1. | |||
| INT (ESC U+0061): Interrupt (used to initiate the mode negotiation | INT (ESC U+0061): Interrupt (used to initiate the mode negotiation | |||
| procedure). The display count SHALL NOT be altered. | procedure). The display count SHALL NOT be altered. | |||
| SGR (U+009B Ps U+006D): Select Graphic Rendition. Ps represents the | SGR (U+009B Ps U+006D): Select Graphic Rendition. Ps represents the | |||
| rendition parameters specified in [ISO6429]. The display count | rendition parameters specified in [ISO6429]. (For freely | |||
| SHALL NOT be altered. The SGR code SHOULD be stored for the | available equivalent information, please see [ECMA-48].) The | |||
| current source. | display count SHALL NOT be altered. The SGR code SHOULD be stored | |||
| for the current source. | ||||
| SOS (U+0098): Start of String. Used as a general protocol element | SOS (U+0098): Start of String. Used as a general protocol element | |||
| introducer, followed by a maximum 256-byte string and the ST. The | introducer, followed by a maximum 256-byte string and the ST. The | |||
| display count SHALL NOT be altered. | display count SHALL NOT be altered. | |||
| ST (U+009C): String Terminator. End of SOS string. The display | ST (U+009C): String Terminator. End of SOS string. The display | |||
| count SHALL NOT be altered. | count SHALL NOT be altered. | |||
| ESC (U+001B): Escape. Used in control strings. The display count | ESC (U+001B): Escape. Used in control strings. The display count | |||
| SHALL NOT be altered for the complete escape code. | SHALL NOT be altered for the complete escape code. | |||
| skipping to change at line 1787 ¶ | skipping to change at line 1788 ¶ | |||
| As already stated in Section 3.18, security in media SHOULD be | As already stated in Section 3.18, security in media SHOULD be | |||
| applied by using DTLS-SRTP [RFC5764] at the media level. | applied by using DTLS-SRTP [RFC5764] at the media level. | |||
| Further security considerations specific to this application are | Further security considerations specific to this application are | |||
| specified in Section 3.18. | specified in Section 3.18. | |||
| 11. References | 11. References | |||
| 11.1. Normative References | 11.1. Normative References | |||
| [ECMA-48] Ecma International, "ECMA-48: Control functions for coded | ||||
| character sets", 5th edition, June 1991, | ||||
| <https://www.ecma-international.org/publications-and- | ||||
| standards/standards/ecma-48/>. | ||||
| [ISO6429] ISO/IEC, "Information technology - Control functions for | [ISO6429] ISO/IEC, "Information technology - Control functions for | |||
| coded character sets", ISO/IEC ISO/IEC 6429:1992, December | coded character sets", ISO/IEC ISO/IEC 6429:1992, December | |||
| 1992, <https://www.iso.org/obp/ui/#iso:std:iso- | 1992, <https://www.iso.org/obp/ui/#iso:std:iso- | |||
| iec:6429:ed-3:v1:en>. | iec:6429:ed-3:v1:en>. | |||
| [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate | [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate | |||
| Requirement Levels", BCP 14, RFC 2119, | Requirement Levels", BCP 14, RFC 2119, | |||
| DOI 10.17487/RFC2119, March 1997, | DOI 10.17487/RFC2119, March 1997, | |||
| <https://www.rfc-editor.org/info/rfc2119>. | <https://www.rfc-editor.org/info/rfc2119>. | |||
| End of changes. 4 change blocks. | ||||
| 7 lines changed or deleted | 13 lines changed or added | |||
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